SIP Stack extensions to be added to the next spec revision. Only these may be safely used in
the interim between now and the next release. SipStackImpl implements this interface.
The following new stack initialization flags are defined (not the gov.nist prefix will be
dropped when the spec is updated):

Set the list of cipher suites supported by the stack. A stack can have only one set of
suites. These are not validated against the supported cipher suites of the java runtime, so
specifying a cipher here does not guarantee that it will work.
The stack has a default cipher suite of: